Back in Tokyo, after the fireworks spectacular, I went to Yoyogi Park. An announcement was playing: “Rollerblading is dangerous, make sure you don’t do it! And be sure to not play catch! And stay off the bike paths! And don’t run in the non-running areas!” I was barely ten feet into the park when I heard those broadcast rules in both Japanese and English. As the rules were sermonized overhead, people moved with heat-stroke torpidity, smartphones cradled near their faces. Last fall, while walking through Yoyogi, I counted: 97 out of 100 people were looking at their phones. Nobody was doing anything that looked particularly fun. Never have I felt it more acutely: The world doesn’t need a park that bans rollerblading. It needs one that bans smartphones.